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lothar baier
Some things or actually a lot of things we do for a hobby have nothing to do with logic, sometimes you just do things for fun, i have about $350 in the hobber including all acessories, i bought it not to make money but i figured that its a nice complement to my metal hobby shop and $350 is a ammount that i can justify spending on a hobby !
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Why would somebody want to fix testequipment or build a ham radio rig ? it cheaper to buy especially if you put in all the time you spend - you do it for fun and to learn something, you gain alot of valuable skills by practicing - as it says practice makes perfect, the other reason is that you have control over your parts and even if they are not available anymore down the road you can still make them and fix your equipment, also you can make them better by using more advanced materials. Plastic gears normally are not hobbed except if you use delrin, PVC is a pain because it leaves a bunch of burrs that need to be removed, the other side of PVC is that it becomes brittle over the years, normally the gears HP used were made in a very crude way - injection molding which has a high yield and is cheaper in Qty. My idea is to either use delrin or aluminum, the forces on the flanks of those gears are not very high and the rotating speed is very slow so by far the specs are no challenge. All you need to know to make them is the number of teeth , the diameter and the pressure angle, height and id of the gear. Bob Groschen <rpgroschen@...> wrote: ----- Original Message -----
From: "Chuck Harris" <cfharris@...> To: <hp_agilent_equipment@...> Sent: Wednesday, November 07, 2007 8:27 PM Subject: Re: [hp_agilent_equipment] opertunity to have uWaveEngineer1968 test his gear hobber - 8640B for $1 All of the gears are available off the shelf.Yes, this is correct. Why would youBecause it's cheaper than the alternatives? Because it's his/her hobby? Because they want to? I rebuild test equipment because I want to. If need had anything to do with it, my collection would be reduced to a tiny fraction of its size. If you recall, 5 or 6 months ago, I offered to spec all of theApparently I'm not the only one who believes that this effort you propose is not worth the expense in acquiring and shipping a 8640B, particularily one with the most desirable options. If stripped of options, an 8640B can be had for about $100- $150. Adding in those options easily doubles the price, for a dead or cirppled one. Shipping alone would cost $60 - $75 on top of the acquisition price. An 8640B is about 50 lbs in its birthday suit and UPS is famous for pulverizing anything this heavy. I have limited experience with FedEx and items this heavy, but they appear to be better than UPS for a slightly higher shipping charge. So you propose exchanging a couple hundred dollar generator for the info on what, a half dozen off-the-shelf gears? I'm sorry Chuck, but for me that's a stretch. For the same effort, I could ship just the gears to any of a half dozen mechanical engineering friends, get the same info and still get the gears back. I for one don't give a rat's ass for the drawings. All I would need is a generic mechanical description of the part(s). McMaster-Carr P/N's would be nice (assuming they have them) but not necessary, as I can use catalogs & the internet as well as the next person. Best Regards, Bob Groschen Monument, CO __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around |
